Multiapertured magnetic cores



Au 18, 1964 u. F. GIANoLA 3,145,370

MULTAPERTURED MAGNE:Tc coRES Fi1ed June 25 1962 4 SheetsSheet Au 18, 1964 u. F. GIANoLA 3,145,370

MULTIAPBRTURED MAGNETc coRBS Fi1ed June 25. 1962 4 SheetSSheet 2 fcf loSSes' 7 as noted aboVe, the Z signal act to n1ainta1 tho eXiSfing negative InagneZa0oo of the legS 40 of aH 0ve cofes 300, 305, 310, 315, and 320.

SobSequon0y, the ootput of ffghthaod aoeffufe of each of the cofes fepfeSented in FI(f, 3 iS )fin1ed by appy ing to each of the legS 40 a P signal ffom the Soofce 308, Whioh aofS to fevefso the oegaoyo Tnagnotzaton SfateS of theSe legS. Tho ampHtnde of the P Sfgoal is selecfed fo be gfoatef than ff1e thfe hold fof SVvifching be tWeon logS 40 and 30 bl1t loSS thanfhe thTeShold for sVifch fng betvveen leg 40 and 20. Tf efefole, tho n1agnotiza tion conditionS of tho leg 30 and 40 of the 1 cofoS 310 and 315 afo Te pectively revefSed in feSponSe to a P Sign L vvhile the nlagnefiZation conditionS of the legS 30 and 40 of eaoh of tf e 0 cofes 300, 305, and 310 afe leff undiSfofbod as a Tesut theroof Tho condifionS of the vo coToS foHowing a P signa1 arc depicted in the fonfth fo of FIG. 4.

The 0ux fevefSal in leg 40 of each of fbe cofes 310 nd 315 in feS )onSe o tho P signal induceS a cuffent i 1 t1o infofoofe coupling Winding which eXfondS betWeen 1og 0 of fhe co e 310 and leg of the cofo 315, and in ff e Winding vvbfch extendS betvvoen leg 40 of tho core 315.and log 10-of theoolo 320. TheSe induoed curfentS -produoe Inagnetoo1otive fofceS in the difection of exiSting InagI1efiZatfo 1 of fflo logs 10 of the cofeS 315 and 320,

1hoTeby pfodocing no signf0cant fiI1x change thofein,

TffoSe inducod coffonfs do, hovvever, op oSe ffle SWitching actfon of .P nd Teduce tf e nofnagnefomotve fofceS on legS 00 of tho oo es 310 and 315. Therefofe, the magnitLldeS of fhe induced cuffentS hould be Tedoced as faT aS poSSible by olaking the fe istances of theso coupling -WindingS aS la ge aS possible, compatible Wh the gain pfovided by tho fofn -fotio thofeof fo co11penSate fol loSSeS in the sobSeqoent t anSfer ooo afion deSC ibo(1.

bclovV. Pfacfc l1y, tho opfin1 n1 TeSisfance iS genoraHy I)1^ovidod,by appfopfiate.choice of the diHIIlefer and length of wife used fof the coupling Vindng,

Finally, the applfcation of an /L Signal ffom the Soufce to the log of each of tho cofes 300, 305, 310, 315, and 320 oleors the Tigflt hand soction of each of the cores 310 and 315 and transfeTS the 1 fepreSena tions formefly Sfofed fhereinto the left-hand secoonS of the 1 eSpoctivo adjaoent cofeS 315 and 320. Spoci0Cauy,

the -A ignal acts to foSet the legS 40 ofthe cofeS 310 and 315 to theirnegatfvo (dov/n Zafds) Inagnetizaion Sfafes, vvhile Inaintaining fhe eXiSting negative nagnoffZationS of the IegS0of the col oS 300, 305, and 320. By Selecfing the afn lffllde of the z SignaI fo oxceed tho thfeShold fof svvitching betvveen fhe legS 30 and0, takfng into account the oppoSiogInagneton1otiyefofcopfoduced by the cUffent inducedin the intefcoTe coupling v/inding, a,0UX fovefsal is prodoced in each of the coTeS 310 and 315 in fho path vhfchinC1udes tho legS 30 and 40.

Tho0ux changes in the1egS 40 of the cofes 310 and 315 in fesoonSe to an z Sfgnal induCe correnfS in the intef- .oore coupling vvindingSvhiCh include the leads 303 and 304. These, coffentS fiow in a diTection fo TevefSe the Inagnefization of the legS 10 of the cofeS 315 and 320, theTeby -inSeftf g 1 TepfeSentationS thefein. As Inen tiofled above, thefufnS fatio of each of tho coHpHng vnd ingS pfovideS fho0oX gafn needed fo conlpenSate foT tfanS- The feSolt iSthat a l iS tranSfeTTed ffom cofe 310 to core 315 and ffon1 core 315to core 320, and f11H svvifching ontput volfages afe induced in each of the Windings Connecting coTeS 310 and 315 to the ufiliZation cifcI1it 313.

The action of A on cores300, 305, and 320 is to n1ail1- tai11the eXisting negative n1agnetization of legs 40 of theSe cofes sovthat no large tranSfef cuffent iS induced in the coffeSponding outpuf vvindingS, KZith the feSult that a 0,, is effectively tfanSfeffed ffoIn core 300 to cofe 305 and ffon1 cofe 305 to cofe 310 and zefo output iS induced in the vinding connecting cofe 320 to the utilization circuit 312. Sin ilarly Zefo outpotS afe induced in the vvindingS ooooocngooes 300, 305, and 320 fo the 11tilization ciT ouft 313. ny Sfnall cufrent that lnay be indnced in toese outpllt windingS as a reSult of TevefSible nx changes in the ogs 40 (atffibI1table to fhe nonidea1 Tectangulaf hySteTesiS loop of a pfacfica1 cofe nlatefio.1) Will be efec tive1y absofbod by the inductance and dissipated if1 tho Tesi tance of the output yvindingS.

Tho 0nal fepreSentation of fhe cofeS 300, 305, 310, 315, and 320 in reS onse to the above-Speci0ed foufhaSe olock ignal equence iS Shovvn in the botton1 fow of FI(. 4. It iS asSUIned thaf a O input is pfovided by tho serial in I1t oufce 303 into cofe 300 dufing of in1 Inediately foHoyving the A signaL A 1 could have equaHy yve11 been inSe ted into oofe 300 at this tiIT1c. In an exactly Sifflilar n1annef the vVoTd Stofed in the Shift TegiStof de )iotod in F1(. 3 is tfanSfeffed one fufthof digft to the Tight fonowing tho coInpletion of eaoh P A P and A Si na1 Sequence. 7

AS noted he einabove, a .binary O Signal iS opfe Sented by oosftive nlagnetization of the leg 10 of aoofe of the type incuded in FIG. 3, vvhne a 1 indication iS fepfeSeofed by negative magnetfZation of tho leg 10 tefeof. For oiff ef a l of .a 0 fepreSentation, the leg 40 is nlagnefiZed in the negative of downvvafdS difection. The legs 20 ond 30 Serve on1y to provide cloSUfe vvithin the coTe fof the uXeS ffon1 the legS 10 and 40. Both of the egS 20 and 30 aTe Inagnefized upWafds if the cofe haS a 1 Stored theTein. IIovvevef, the SettingS of the legS 20 and 30 are uniInpoftant in a oofe containing a O, It is only neceSSafy that theif n1agnetizatioos SatSfy the fequifenlent fof f11x cloSufe taking into account the oagnetizations of the legS 10 and 40.

Fof convenience it aS aSSumod above thaf the leg 20 of each of the 0 cofeS 300, 305, and 320 vvS initially magnetizod downwardS and that leg 30 was Tnagnetized upvVafdS, aS indicated in the HrSt, Second, and fifth co1- ,UInnS of the 0fSt row in FG. 4. By coI1fra t it iS noted that the fina1 0 ropToSenfation of each of tho cores 300 and 305 (in the fifth Tow of FIG, 4) inclode a positively 1T1agnetizod leg 20 and a negatively Inagnefized leg 30. ()n the other hand, in the final 0 Tepresentation ofthe Cofe 310, the leg 20 thereof iS nlagnetfZed in a negative diTection and the leg 30 in a poSitive direction. It is, however, again nofed that the n1agnetiZationS of the logS 20 and 30 in a 0 core afe uniInportant. ThiS is d1e to tho fact that a subsequent P Signal applied to a 0 cofe caI1Ses the legS 10 and 20 thefeof to be each lnagnetiZed in a positive direction and the legs 30 and 40 thereof to be each nlagnetiZed in a negative difection, fegafdleSS of Which type of 0 fepfesentation the cofe initially had stofed thefeinv A new binary digit Inay, fof exanlple, be insefted Seria1- ly into the fifSt cofe 300 of the fegisfer shoWn iTl 1I(}, 3 dnfing of immediately following each A signa1. In addition, the Seial output fTon1 the Tighthand or outpnt coTo 320 nay, of coufSe, be uSed to pfovide the inpnf to additional stageS of the type of the.0ve depicted in FIG. 3 and descfibed in detail herein. ISo, a nevv vvo d n1ay bo wTiffen info the fegisteT Shown in FIG. 3 duTingfhe ap lication thefeto of an A signal by using fhe parallc1 input Windings 370, 371, 372, 373, and 374 cop1od to the paTallel Signa1 Soufce 304.

In ofder to increaSe the operational n1inin1un^1 and maximum InarginS for P SignalS, tho goon1etfy of each of the hefeindeScribed cofes Should be S lch that the ITlean fiux path length fol SWftohing be een legS 10 and 20 iS greatef than that befvveeI11egS 20 and 30, The Tatio of the InaJon1un and IniniIT111m dfive signalS iS defefInined by and ideally ap roXhnafely e qual fo tho Tato of the Ux path lengths. Pfacficalfy what thiS fneanS iS that the diaInetef of the apeffuro bofveon fhe legS 10 and 20 Should be lafgeT (for exanple, by a factof of 2) than the dian1etef of the apeftu e betwoen the legS 20 nd 30.

In addition, to incfeaSe tlle operational ITlininlum and InaxiInun1 IIlaTginS fof P Signals, the geoInetry of oach 

1. IN COMBINATION IN A MAGNETIC SHIFT REGISTER CIRCUIT, A PLURALITY OF CORES ARRANGED IN A LINEAR ARRAY, EACH OF SAID CORES BEING MADE OF A RECTANGULAR HYSTERESIS LOOP MATERIAL AND HAVING THREE APERTURES THERETHROUGH WHICH DEFINE FOUR SUBSTANTIALLY PARALLEL FLUX-CARRYING LEGS INCLUDING AN INPUT LEG AND AN OUTPUT LEG, MEANS FOR SETTING SAID CORES TO AN INITIAL BINARY REPRESENTATION, INTERCORE WINDING MEANS CHARACTERIZED BY A STEP-DOWN TURNS RATIO COUPLING THE OUTPUT LEG OF ONE CORE TO THE INPUT LEG OF THE NEXT ADJACENT CORE OF SAID ARRAY, AND FOUR-PHASE CLOCK SIGNAL MEANS COUPLED TO SAID CORES FOR ADVANCING SAID INITIAL REPRESENTATION FROM CORE TO CORE IN A DIGITBY-DIGIT MANNER, SAID FOUR-PHASE CLOCK SIGNAL MEANS INCLUDING FIRST WINDING MEANS COMPRISING A WINDING INDUCTIVELY COUPLED IN A FIRST WINDING DIRECTION TO THE LEG IMMEDIATELY ADJACENT THE INPUT LEG OF EACH CORE OF SAID ARRAY, SAID FOUR-PHASE CLOCK SIGNAL MEANS FURTHER INCLUDING SECOND WINDING MEANS COMPRISING A WINDING INDUCTIVELY COUPLED IN THE FIRST WINDING DIRECTION TO THE INPUT LEG OF EACH CORE OF SAID ARRAY AND A WINDING INDUCTIVELY COUPLED IN THE OPPOSITE WINDING DIRECTION TO THE OUTPUT LEG OF EACH CORE OF SAID ARRAY. 